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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares | 3 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Series B Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375
Series C Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | 0.4921875 | 0.4921875 | 0.4921875 | $ 0.4921875 | $ 0.4921875 | $ 0.4921875
Series D Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | $ 0.5 | $ 0.50 | $ 0.51111 |  |  |

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